Gene could unlock greater wheat yields for a growing population

A study from the University of Adelaide has discovered molecular pathways regulated by a gene traditionally used to control wheat-flowering behavior could be altered to achieve greater yields. The research was published in ...

Melon's molecular armor: New insights into crop protection

Melon crops face significant threats from pests such as aphids and diseases including powdery mildew, which can lead to substantial economic losses and affect food security. Traditional pest management strategies often prove ...

How a long-lost fish species was brought back to Bendigo

The southern pygmy perch hadn't been seen in Bendigo Creek since the mid-19th-century goldrush, when a booming town sprang up around the central Victorian waterway. This attractive small fish, which displays bright colors ...

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Genetic diversity

Genetic diversity is a level of biodiversity that refers to the total number of genetic characteristics in the genetic makeup of a species. It is distinguished from genetic variability, which describes the tendency of genetic characteristics to vary.

The academic field of population genetics includes several hypotheses and theories regarding genetic diversity. The neutral theory of evolution proposes that diversity is the result of the accumulation of neutral substitutions. Diversifying selection is the hypothesis that two subpopulations of a species live in different environments that select for different alleles at a particular locus. This may occur, for instance, if a species has a large range relative to the mobility of individuals within it. Frequency-dependent selection is the hypothesis that as alleles become more common, they become less fit. This is often invoked in host-pathogen interactions, where a high frequency of a defensive allele among the host means that it is more likely that a pathogen will spread if it is able to overcome that allele.

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